CN212793042U - Multifunctional positioning and clamping device of numerical control lathe - Google Patents

Abstract

The utility model belongs to the technical field of the processing, specific multi-functional positioning and clamping device of numerical control lathe that says so. The clamping device comprises a replaceable taper shank, a positioning frame main body, a cylindrical bearing, a positioning frame cover, a locking bolt and a supporting end; the right end of the positioning frame main body is in threaded connection with the replaceable taper shank; the locating rack cover cap is sleeved at the supporting end and is fixed at the left end of the locating rack main body through a locking bolt after being matched with the cylindrical bearing. The utility model relates to a multifunctional positioning and clamping device of a numerical control lathe with simple structure, which can realize the use and processing on various machine tools by replacing a taper shank; a set of positioning system can replace a plurality of centers; the utility model discloses can improve the machining efficiency of part, guarantee positioning accuracy, convenient and fast, reduce the special top cost of customization, solve the problem of carrying out the axle type location of slender axles on multiple numerical control lathe.

Description

Multifunctional positioning and clamping device of numerical control lathe

Technical Field

The utility model belongs to the technical field of the processing, specific multi-functional positioning and clamping device of numerical control lathe that says so.

Background

The commercial vehicle processing products are characterized by multiple varieties, small batch and various models of the existing processing equipment. When processing parts such as slender shafts, crankshafts and cams, special center supports are usually adopted to eliminate the processing deformation of various parts. When the product is remodeled, tips with different specifications need to be replaced frequently, so that the production efficiency is low, and the equipment supporting precision is reduced. Particularly, for the center positioning and center hole punching of slender shaft parts, auxiliary support is needed, and a dial indicator is used for aligning workpieces, so that time and labor are wasted.

At present, the centre that adopts on the market mostly is dead centre, can not change moreover, and the structure is complicated, and the function is single, does not have the interchange function, only suits to process with the part of contract kind system. For the central positioning and centering of the slender shaft type parts, auxiliary support is needed and the workpiece is aligned by a dial indicator, which wastes time and labor. In addition, due to the fact that the arrangement of the bearing is unreasonable, the center has large radial runout when in work, the rotation precision is not high, the machining precision is reduced, a special auxiliary center device needs to be arranged on some parts for positioning, the period is long, the practicality of accurate customization is not large, the cost is increased, and the efficiency is not obviously improved. And the tip can only be suitable for the installation of one kind of caudal vertebra.

Disclosure of Invention

The utility model provides a multifunctional positioning and clamping device of a numerical control lathe with simple structure, which can realize the use and processing on various machine tools by changing a taper shank; a set of positioning system can replace a plurality of centers; the utility model discloses can improve the machining efficiency of part, guarantee positioning accuracy, convenient and fast, reduce the special top cost of customization, solve the problem of carrying out the axle type location of slender axles on multiple numerical control lathe.

The technical scheme of the utility model is explained as follows with the attached drawings:

a multifunctional positioning and clamping device of a numerical control lathe comprises a replaceable taper shank 5, a positioning frame main body 4, a cylindrical bearing 3, a positioning frame cover 1, a locking bolt 8 and a supporting end; the right end of the positioning frame main body 4 is in threaded connection with the replaceable taper shank 5; the positioning frame cover cap 1 is sleeved at the supporting end and is fixed at the left end of the positioning frame main body 4 through a locking bolt 8 after being matched with the cylindrical bearing 3.

The supporting end comprises a positioning shaft seat 2; the positioning shaft seat 2 is arranged in the cylindrical bearing 3; the positioning frame cover cap 1 is sleeved on the cylindrical bearing 3; the positioning shaft seat 2, the cylindrical bearing 3 and the positioning frame cover cap 1 are assembled into a whole and then fixed at the left end of the positioning frame main body 4 through a locking bolt 8.

The supporting end comprises a small tip supporting seat 6 and a small tip 7; the small tip supporting seat 6 is arranged in the cylindrical bearing 3; the small center 7 is arranged in the small center supporting seat 6; the positioning frame cover cap 1 is sleeved on the cylindrical bearing 3; the small center supporting seat 6, the small center 7, the cylindrical bearing 3 and the positioning frame cover cap 1 are assembled into a whole and then fixed at the left end of the positioning frame main body 4 through the locking bolt 8.

A square through groove 61 is formed in the small tip supporting seat 6; the front end of the small tip supporting seat 6 is a taper surface 62; the small tip supporting seat 6 is made of alloy quenched and tempered steel, the outer surface and the front end head part of the small tip supporting seat are galvanized, the size precision of the right end outer diameter and the left end outer diameter is 0.005mm-0.01mm, the surface roughness can reach Ra0.8mm, and the coaxiality position precision of the right end outer diameter and the left end outer diameter is 0mm-0.005 mm; the outer diameter of the right end of the small tip supporting seat 6 is connected with the inner diameter of the cylindrical bearing 3, and a boss is arranged on the small tip supporting seat; the middle part of the small center supporting seat 6 is also provided with a fleeing-proof boss 63 for preventing axial fleeing; the left end of the small center supporting seat 6 is provided with a taper hole connected with a small center; the aperture size precision of the taper hole is 0.005mm-0.01mm, the surface roughness can reach Ra0.8mm, and the position precision of the coaxiality of the aperture of the taper hole and the right-end outer diameter aperture is 0mm-0.005 mm; the small center 7 is made of alloy quenched and tempered steel, the dimensional accuracy of a left end conical surface and a right end conical surface 72 of the small center is 0.005mm-0.01mm, the surface roughness can reach Ra0.8mm, and the coaxiality position accuracy of the left end conical surface and the right end conical surface of the small center is 0mm-0.005 mm; the right end of the small center 7 is connected with the small center supporting seat 6 and the positioning frame cover 1.

The positioning frame main body 4 is made of alloy quenched and tempered steel; the positioning frame main body 4 is of a hollow structure, the size precision of the inner aperture 46 at the left end of the positioning frame main body is 0.005mm-0.01mm, the surface roughness can reach Ra0.8mm, the size precision of the shaft diameter 47 at the right end of the positioning frame main body is 0.005mm-0.01mm, and the surface roughness can reach Ra0.8mm; the coaxiality position precision of the inner aperture 46 at the left end and the shaft diameter 47 at the right end is 0-0.005 mm; a first hole 41 for fastening a wrench and replacing a taper shank is formed in the shaft diameter 47 at the right end; a positioning table for mounting the cylindrical bearing 3 is arranged in the left end of the positioning frame main body 4; three second holes 42 are formed in the positioning table; the outer part of the left end of the positioning frame main body 4 is provided with a bolt hole 43 for fixing a locking bolt 8; the front and the rear of the positioning frame main body 4 are provided with first hollows 44 used for enabling a turning tool to enter the interior to process a central hole; the upper part and the lower part of the positioning frame main body 4 are provided with second hollows 45 which are used for a user to observe the processing condition conveniently; and an inner groove for installing the positioning frame cover cap 1 is arranged on the positioning frame main body 4.

The replaceable taper shank 5 can replace taper shanks of different types.

The cylindrical bearing 3 can replace bearings of different types by using a bearing disassembling tool 9; the removal bearing tool 9 comprises a tapped cover plate 91 and three cylinders 92 arranged on the cover plate 91.

The small center 7 can be replaced by a center disassembling tool 10 in different types; the tool 10 comprises a tool main body of the dismounting center, wherein the tool main body of the dismounting center is conical, and the top 102 of the tool main body of the dismounting center is a knocking surface; the lower end of the tool body of the detaching centre is arranged in the square through groove 61, and the side surface 101 of the tool body of the detaching centre is contacted with the tail part 71 of the small centre.

The locating rack covers 1 stainless steel material.

The positioning shaft seat 2 is made of alloy quenched and tempered steel; the size precision of the outer diameter and the inner aperture of the positioning shaft seat 2 is in the range of 0.005mm-0.01mm, the roughness of the inner surface can reach Ra0.8mm, and the coaxiality position precision of the outer aperture and the inner aperture is in the range of 0mm-0.005 mm; the outer diameter of the positioning shaft seat 2 is connected with the inner diameter of the cylindrical bearing 3, and a boss for preventing axial movement is arranged at the left end of the positioning shaft seat.

The utility model has the advantages that:

1) the utility model discloses can improve the machining efficiency of part, guarantee positioning accuracy, convenient and fast, reduce the special top cost of customization.

2) The positioning system of the utility model has small radial run-out and high rotation precision; different kinds of apexes can be mounted.

3) The utility model discloses can solve the problem of carrying out the axle class location of slender axles on multiple numerical control lathe, it is simple and convenient to change, and the universal ability is strong to can reach the processing requirement of part.

Drawings

FIG. 1 is an exploded view of all the components of the present invention;

FIG. 2 is an exploded view of a first method of using the present invention to machine a dowel hole;

fig. 3 is an assembly view of a first tip positioning according to the present invention;

fig. 4 is an exploded view of a second positioning of the present invention using a square center;

fig. 5 is an assembly view of a second tip positioning of the present invention;

FIG. 6a is an axial view of the spacer body;

FIG. 6b is a front view of the spacer body;

FIG. 6c is a left side view of the spacer body;

FIG. 6d is a top view of the spacer body;

FIG. 7a is an axial view of the use of the bearing removal tool of the present invention;

FIG. 7b is a front view of the use of the bearing removal tool of the present invention;

FIG. 7c is a left side view of the use of the bearing removal tool of the present invention;

FIG. 7d is a top view of the use of the bearing removal tool of the present invention;

figure 8 is an axial view of the use of the present tool for removing a tip.

In the figure: 1. a positioning frame cover; 2. positioning the shaft seat; 2-1, positioning shaft seat with inner hole diameter phi 25; 2-2, the diameter of the inner hole is phi 20 to position the shaft seat; 2-3, positioning shaft seat with inner hole diameter phi 16; 2-4, positioning shaft seat with inner hole diameter phi 12; 2-5, the diameter of the inner hole is phi 10 to position the axle seat; 3. a cylindrical bearing; 4. a positioning frame main body; 41. a first hole; 42. a second hole; 43. bolt holes; 44. a first hollow out; 45. second hollowing out; 46. an inner bore diameter of the left end; 47. the shaft diameter of the right end; 5. the taper shank can be replaced; 5-1, Momo type 4 taper shank; 5-2, Momo 5 taper shank; 6. a small center supporting seat; 6-1, the diameter of the front end is phi 30, and the length is 20; 6-2, the diameter of the front end is phi 40, and the length is 20; 61. a square through groove; 62. A tapered surface; 63. a channeling-preventing boss; 7. a small tip; 71. the tail part of the small center; 72. the right end conical surface of the small tip; 8. locking the bolt; 9. disassembling the bearing tool; 91. a cover plate; 92. a cylinder; 10. disassembling the tip tool; 101. disassembling the side surface of the center tool main body; 102. a top portion;

Detailed Description

Referring to fig. 1, the multifunctional positioning and clamping device for the numerical control lathe comprises a replaceable taper shank 5, a positioning frame main body 4, a cylindrical bearing 3, a positioning frame cover 1, a locking bolt 8 and a supporting end; the right end of the positioning frame main body 4 is in threaded connection with the replaceable taper shank 5; the positioning frame cover cap 1 is sleeved at the supporting end and is fixed at the left end of the positioning frame main body 4 through a locking bolt 8 after being matched with the cylindrical bearing 3.

The replaceable taper shank 5 adopts a Moire type 3 taper shank, and can also be replaced by a Moire type 4 taper shank 5-1 and a Moire type 5 taper shank 5-2.

Example one

Referring to fig. 2 and 3, the method is an assembling method for quickly positioning and processing center holes of parts such as slender shafts, crankshafts and cam shafts. The supporting end comprises a positioning shaft seat 2.

The right end of the positioning frame main body 4 is connected with a replaceable taper shank 5, and the replaceable taper shank is provided, wherein only three types of Mohs 3, 4 and 5 are drawn in the drawing, and the Mohs 0, 1 and 2 can be replaced. They are locked by screw means. The left end of a positioning frame main body 4 can be connected with a bearing cylinder 3, the bearing cylinder 3 is connected with a diameter positioning shaft seat 2, wherein the diameter positioning shaft seat 2 is a positioning shaft seat with an inner hole diameter of phi 30, and can be replaced by a positioning shaft seat 2-1 with an inner hole diameter of phi 25, a positioning shaft seat 2-2 with an inner hole diameter of phi 20, a positioning shaft seat 2-3 with an inner hole diameter of phi 16, a positioning shaft seat 2-4 with an inner hole diameter of phi 12 and a positioning shaft seat 2-5 with an inner hole diameter of phi 10, and the diameter positioning shaft seat which is correspondingly matched can be manufactured according to a processed part, and a positioning frame cover 1 is arranged on the positioning frame main body 4 after the bearing cylinder 3 and the diameter positioning shaft seat 2 are arranged. The machining method can quickly position parts such as the slender shaft, the crankshaft and the cam shaft, can solve the problem that each part needs to be installed and found, saves time, improves machining efficiency, is more reasonable in a certain machining process, and can finish quick machining. And the processing precision can be ensured.

Example two

Referring to fig. 4 and 5, the method is an assembling method for quickly positioning the central holes of the parts such as the slender shaft, the crankshaft and the cam shaft.

The supporting end comprises a small tip supporting seat 6 and a small tip 7.

The right end of the positioning frame main body 4 is connected with a replaceable taper shank 5, and the replaceable taper shank is provided, wherein only three types of Mohs 3, 4 and 5 are drawn in the drawing, and the Mohs 0, 1 and 2 can be replaced. They are locked by screw means. The left end of a positioning frame main body 4 can be connected with a bearing cylinder 3, the bearing cylinder 3 is connected with a small tip supporting seat 6, the small tip supporting seat 6 is a small tip supporting seat with the front end diameter of phi 20 and the length of 20, the small tip supporting seat 6-1 with the front end diameter of phi 30 and the length of 20 and the small tip supporting seat 6-2 with the front end diameter of phi 40 and the length of 20 can be replaced, the small tip supporting seat which is correspondingly matched can be manufactured according to processing parts, and a positioning frame cover 1 is installed on the positioning frame main body 4 after the bearing cylinder 3 and the small tip supporting seat 6 are installed, and a locking bolt 8 is installed at last.

Referring to fig. 6a, 6b, 6c and 6d, the positioning frame body 4 is made of alloy quenched and tempered steel; the positioning frame main body 4 is of a hollow structure, the size precision of the inner aperture 46 at the left end of the positioning frame main body is 0.005mm-0.01mm, the surface roughness can reach Ra0.8mm, the size precision of the shaft diameter 47 at the right end of the positioning frame main body is 0.005mm-0.01mm, and the surface roughness can reach Ra0.8mm; the coaxiality position precision of the inner aperture 46 at the left end and the shaft diameter 47 at the right end is 0-0.005 mm; a first hole 41 is formed in the shaft diameter 47 of the right end, and the first hole 41 is used for installing and fastening the positioning frame main body and the replaceable taper shank 5, the Mohs type 4 taper shank 5-1 and the Mohs type 5 taper shank 5-2 by using a wrench; a positioning table for mounting the cylindrical bearing 3 is arranged in the left end of the positioning frame main body 4; three second holes 42 are formed in the positioning table; the outer part of the left end of the positioning frame main body 4 is provided with a bolt hole 43 for fixing a locking bolt 8; the front and the rear of the positioning frame main body 4 are provided with first hollows 44 used for enabling a turning tool to enter the interior to process a central hole; the upper part and the lower part of the positioning frame main body 4 are provided with second hollows 45 which are used for a user to observe the processing condition conveniently; and an inner groove for installing the positioning frame cover cap 1 is arranged on the positioning frame main body 4.

Referring to fig. 7a, 7b, 7c and 7d, the cylindrical bearing 3 can be replaced with different types of bearings using the bearing removal tool 9; the bearing dismounting tool 9 comprises a cover plate 91 and three cylinders 92 arranged on the cover plate 91, and when the bearing dismounting tool 9 is dismounted, the three cylinders 92 of the bearing dismounting tool 9 penetrate through the three second holes 42 of the positioning frame main body 4 by uniformly striking the cover plate 91 of the bearing dismounting tool 9, so that the cylindrical bearing 3 is dismounted.

Referring to fig. 8, the small center 7 can be replaced by different models by using a center disassembling tool 10; the tool 10 comprises a tool main body of the dismounting center, wherein the tool main body of the dismounting center is conical, and the top 102 of the tool main body of the dismounting center is a knocking surface; the lower end of the tool body of the detaching centre is arranged in the square through groove 61, and the side surface 101 of the tool body of the detaching centre is contacted with the tail part 71 of the small centre. When the center tool 10 is disassembled, the center tool 10 is disassembled through the square through groove 61 of the small center supporting seat 6 by uniformly knocking the top 102 of the center tool 10; the small tip 7 is ejected from the tapered surface 62 of the small tip support seat 6 by the side surface 101 of the tool body of the removable tip contacting the tail portion 71 of the small tip.

Locating rack shroud 1 sets up to stainless steel, prevents to be corroded, and pleasing to the eye, mainly protects cylindrical bearing 3, prevents that iron blood and impurity from getting into cylindrical bearing 3 and locating rack main part 4 in the middle of, and it is installed in the inner groovy of locating rack main part 4, utilizes locking bolt 8 to lock the location and prevents to remove and rotate.

The positioning shaft seat 2, the positioning shaft seat 2-1 with the diameter of an inner hole of phi 25, the positioning shaft seat 2-2 with the diameter of an inner hole of phi 20, the positioning shaft seat 2-3 with the diameter of an inner hole of phi 16, the positioning shaft seat 2-4 with the diameter of an inner hole of phi 12 and the positioning shaft seat 2-5 with the diameter of an inner hole of phi 10 are drawn in the figure, the positioning shaft seat 2 with the corresponding diameter of the inner hole can be manufactured according to the size of a part, the material of the positioning shaft seat is that a modulation diamond has the characteristics of hardness and wear resistance, the inner surface roughness of the outer diameter and the inner aperture of the positioning shaft seat can reach Ra0.8mm within the range of 0.005mm-0.01mm, and the position precision of the outer aperture and the inner. The outer diameter of the positioning shaft seat 2 is connected with the inner diameter of the cylindrical bearing 3, the left end of the boss positioning shaft seat 2 is provided with a boss design, and the boss is mainly used for preventing axial movement and influencing the processing precision of parts.

Referring to fig. 6a, 6b, 6c and 6d, the positioning frame main body 4 is made of modulated alloy steel, and has the characteristics of difficult deformation, high rigidity and difficult abrasion. The external surface is galvanized, which is not easy to corrode and is beautiful. The size precision of the left end inner bore diameter 46 is within the range of 0.005mm-0.01mm, and the surface roughness can reach Ra0.8mm. The size precision of the shaft diameter size 47 of the right end of the positioning frame main body 4 is within the range of 0.005mm-0.01mm, and the surface roughness can reach Ra0.8mm. The coaxiality position precision of the inner bore 46 at the left end of the positioning frame main body 4 and the shaft diameter 47 at the right end of the positioning frame main body 4 is within the range of 0mm-0.005 mm.

The small tip supporting seat set comprises a small tip supporting seat 6 with the diameter phi of 20 and the length of 20, a small tip supporting seat 6-1 with the diameter phi of 30 and the length of 20 at the front end, and a small tip supporting seat 6-2 with the diameter phi of 40 and the length of 20 at the front end. The material is made of modulated alloy steel, and the front end head part is galvanized. Has the characteristics of difficult deformation, high rigidity and difficult abrasion. The external surface is galvanized, which is not easy to corrode and is beautiful. The inner surface roughness of the right end outer diameter and the left end outer diameter can reach Ra0.8mm within the size precision of 0.005mm-0.01mm, and the coaxiality position precision of the right end outer diameter and the left end outer diameter is within the range of 0mm-0.005 mm. 6 right-hand member external diameters of little top supporting seat are connected with 3 internal diameters of cylindrical bearing to be equipped with the boss, 6 middle parts of little top supporting seat are equipped with the boss design, and the boss mainly is in order to prevent axial float, influences the machining precision of part. The left end of the small centre supporting seat 6 is provided with a taper hole which is connected with the small centre 7. The inner surface roughness of the aperture of the taper hole can reach Ra0.8mm within the range of 0.005mm-0.01mm, and the coaxiality position precision of the aperture of the taper hole and the aperture of the outer diameter of the right end is within the range of 0mm-0.005 mm.

The small tip 7 is made of modulated alloy steel. Has the characteristics of difficult deformation, high rigidity and difficult abrasion. The inner surface roughness of the left end conical surface of the small tip and the right end conical surface of the small tip can reach Ra0.8mm within the size precision of 0.005mm-0.01mm, and the coaxiality position precision of the left end conical surface of the small tip and the right end conical surface of the small tip is within the range of 0mm-0.005 mm. The centre with different sizes is selected according to the size of a part, and the right end of the small centre 7 is connected with the small centre supporting seat 6 and the small centre supporting seat sleeve.

The locking bolt 8 is made of modulated alloy steel. Has the characteristics of difficult deformation, high rigidity and difficult abrasion. The outer hexagonal part is galvanized, so that the coating is not easy to corrode and is attractive. The cover cap 1 is used for connecting the locating rack and is fixedly arranged on the locating rack main body 4.

The bearing replacing device 9 is made of modulated alloy steel, and the front end head part is galvanized. Has the characteristics of difficult deformation, high rigidity and difficult abrasion. The external surface is galvanized, which is not easy to corrode and is beautiful.

The tip disassembling tool 10 is made of modulated alloy steel, and the front end head part is galvanized. Has the characteristics of difficult deformation, high rigidity and difficult abrasion. The external surface is galvanized, which is not easy to corrode and is beautiful.

The preferred embodiments of the present invention have been described in detail with reference to the accompanying drawings, however, the present invention is not limited to the details of the above embodiments, and the technical concept of the present invention can be within the scope of the present invention to perform various simple modifications to the technical solution of the present invention, and these simple modifications all belong to the protection scope of the present invention.

It should be noted that the various technical features described in the above embodiments can be combined in any suitable manner without contradiction, and in order to avoid unnecessary repetition, the present invention does not need to describe any combination of the features.

In addition, various embodiments of the present invention can be combined arbitrarily, and the disclosed content should be regarded as the present invention as long as it does not violate the idea of the present invention.

Claims (10)

1. A multifunctional positioning and clamping device of a numerical control lathe is characterized by comprising a replaceable taper shank (5), a positioning frame main body (4), a cylindrical bearing (3), a positioning frame cover (1), a locking bolt (8) and a supporting end; the right end of the positioning frame main body (4) is in threaded connection with the replaceable taper shank (5); the locating rack cover cap (1) is sleeved at the supporting end and is fixed at the left end of the locating rack main body (4) through a locking bolt (8) after being matched with the cylindrical bearing (3).

2. The multifunctional positioning and clamping device for the numerically controlled lathe according to claim 1, characterized in that the supporting end comprises a positioning shaft seat (2); the positioning shaft seat (2) is arranged in the cylindrical bearing (3); the positioning frame cover cap (1) is sleeved on the cylindrical bearing (3); the positioning shaft seat (2), the cylindrical bearing (3) and the positioning frame cover cap (1) are assembled into a whole and then fixed at the left end of the positioning frame main body (4) through a locking bolt (8).

3. The multifunctional positioning and clamping device for the numerical control lathe according to claim 1, wherein the supporting end comprises a small tip supporting seat (6) and a small tip (7); the small tip supporting seat (6) is arranged in the cylindrical bearing (3); the small center (7) is arranged in the small center supporting seat (6); the positioning frame cover cap (1) is sleeved on the cylindrical bearing (3); the small center supporting seat (6), the small center (7), the cylindrical bearing (3) and the positioning frame cover cap (1) are assembled into a whole and then fixed at the left end of the positioning frame main body (4) through a locking bolt (8).

4. The multifunctional positioning and clamping device for the numerical control lathe according to claim 3, wherein a square through groove (61) is formed in the small tip supporting seat (6); the front end of the small tip supporting seat (6) is a taper surface (62); the small tip supporting seat (6) is made of alloy quenched and tempered steel, the outer surface and the front end head part of the small tip supporting seat are galvanized, the size precision of the right end outer diameter and the left end outer diameter is 0.005mm-0.01mm, the surface roughness can reach Ra0.8mm, and the coaxiality position precision of the right end outer diameter and the left end outer diameter is 0mm-0.005 mm; the outer diameter of the right end of the small tip supporting seat (6) is connected with the inner diameter of the cylindrical bearing (3), and a boss is arranged on the small tip supporting seat; the middle part of the small tip supporting seat (6) is also provided with a fleeing-proof boss (63) for preventing axial fleeing; the left end of the small center supporting seat (6) is provided with a taper hole connected with the small center; the aperture size precision of the taper hole is 0.005mm-0.01mm, the surface roughness can reach Ra0.8mm, and the position precision of the coaxiality of the aperture of the taper hole and the right-end outer diameter aperture is 0mm-0.005 mm; the small center (7) is made of alloy quenched and tempered steel, the size precision of the left end conical surface and the right end conical surface (72) of the small center is 0.005mm-0.01mm, the surface roughness can reach Ra0.8mm, and the coaxiality position precision of the left end conical surface and the right end conical surface of the small center is 0mm-0.005 mm; the right end of the small center (7) is connected with the small center supporting seat (6) and the positioning frame cover cap (1).

5. The multifunctional positioning and clamping device for the numerical control lathe according to claim 1, characterized in that the positioning frame body (4) is made of alloy quenched and tempered steel; the positioning frame main body (4) is of a hollow structure, the size precision of an inner bore (46) at the left end of the positioning frame main body is 0.005mm-0.01mm, the surface roughness can reach Ra0.8mm, the size precision of a shaft diameter (47) at the right end of the positioning frame main body is 0.005mm-0.01mm, and the surface roughness can reach Ra0.8mm; the coaxiality position precision of the inner aperture (46) at the left end and the shaft diameter (47) at the right end is 0-0.005 mm; a first hole (41) for fastening a wrench and replacing a taper shank is formed in the shaft diameter (47) of the right end; a positioning table for mounting the cylindrical bearing (3) is arranged inside the left end of the positioning frame main body (4); three second holes (42) are formed in the positioning table; the outer part of the left end of the positioning frame main body (4) is provided with a bolt hole (43) for fixing a locking bolt (8); the front and the rear of the positioning frame main body (4) are provided with first hollows (44) used for enabling a turning tool to enter the interior to process a central hole; a second hollow (45) which is used for a user to observe the processing condition conveniently is arranged at the upper opening and the lower opening of the positioning frame main body (4); an inner groove for installing the positioning frame cover cap (1) is arranged on the positioning frame main body (4).

6. The multifunctional positioning and clamping device for the numerical control lathe according to claim 1, characterized in that the replaceable taper shank (5) can replace taper shanks of different types.

7. The multifunctional positioning and clamping device for the numerical control lathe according to claim 1, characterized in that the cylindrical bearing (3) can be replaced by different types of bearings by using a bearing disassembling tool (9); the bearing dismounting tool (9) comprises a knocked cover plate (91) and three cylinders (92) arranged on the cover plate (91).

8. The multifunctional positioning and clamping device for the numerical control lathe according to claim 3, characterized in that the small center (7) can be replaced by different types by using a center disassembling tool (10); the center disassembling tool (10) comprises a center disassembling tool main body, wherein the center disassembling tool main body is conical, and the top (102) of the center disassembling tool main body is a knocking surface; the lower end of the tool body of the detaching centre is arranged in the square through groove (61), and the side surface (101) of the tool body of the detaching centre is contacted with the tail part (71) of the small centre.

9. The multifunctional positioning and clamping device for the numerically controlled lathe according to claim 1, wherein the positioning frame cover (1) is made of stainless steel.

10. The multifunctional positioning and clamping device for the numerical control lathe according to claim 2, characterized in that the positioning shaft seat (2) is made of alloy quenched and tempered steel; the size precision of the outer diameter and the inner aperture of the positioning shaft seat (2) is 0.005mm-0.01mm, the roughness of the inner surface can reach Ra0.8mm, and the coaxiality position precision of the outer aperture and the inner aperture is 0mm-0.005 mm; the outer diameter of the positioning shaft seat (2) is connected with the inner diameter of the cylindrical bearing (3), and a boss for preventing axial movement is arranged at the left end of the positioning shaft seat.

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